1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2017-2018 HUAWEI, Inc.
4 * https://www.huawei.com/
5 * Copyright (C) 2021-2022, Alibaba Cloud
6 */
7 #include <linux/security.h>
8 #include <linux/xxhash.h>
9 #include "xattr.h"
10
11 struct erofs_xattr_iter {
12 struct super_block *sb;
13 struct erofs_buf buf;
14 erofs_off_t pos;
15 void *kaddr;
16
17 char *buffer;
18 int buffer_size, buffer_ofs;
19
20 /* getxattr */
21 int index, infix_len;
22 struct qstr name;
23
24 /* listxattr */
25 struct dentry *dentry;
26 };
27
28 static const char *erofs_xattr_prefix(unsigned int idx, struct dentry *dentry);
29
erofs_init_inode_xattrs(struct inode * inode)30 static int erofs_init_inode_xattrs(struct inode *inode)
31 {
32 struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
33 struct erofs_inode *vi = EROFS_I(inode);
34 struct super_block *sb = inode->i_sb;
35 const struct erofs_xattr_ibody_header *ih;
36 __le32 *xattr_id;
37 erofs_off_t pos;
38 unsigned int i;
39 int ret = 0;
40
41 if (!vi->xattr_isize)
42 return -ENODATA;
43
44 /* the most case is that xattrs of this inode are initialized. */
45 if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) {
46 /*
47 * paired with smp_mb() at the end of the function to ensure
48 * fields will only be observed after the bit is set.
49 */
50 smp_mb();
51 return 0;
52 }
53 if (wait_on_bit_lock(&vi->flags, EROFS_I_BL_XATTR_BIT, TASK_KILLABLE))
54 return -ERESTARTSYS;
55
56 /* someone has initialized xattrs for us? */
57 if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags))
58 goto out_unlock;
59
60 /*
61 * bypass all xattr operations if ->xattr_isize is not greater than
62 * sizeof(struct erofs_xattr_ibody_header), in detail:
63 * 1) it is not enough to contain erofs_xattr_ibody_header then
64 * ->xattr_isize should be 0 (it means no xattr);
65 * 2) it is just to contain erofs_xattr_ibody_header, which is on-disk
66 * undefined right now (maybe use later with some new sb feature).
67 */
68 if (vi->xattr_isize == sizeof(struct erofs_xattr_ibody_header)) {
69 erofs_err(sb, "xattr_isize %d of nid %llu is not supported yet",
70 vi->xattr_isize, vi->nid);
71 ret = -EOPNOTSUPP;
72 goto out_unlock;
73 } else if (vi->xattr_isize < sizeof(struct erofs_xattr_ibody_header)) {
74 erofs_err(sb, "bogus xattr ibody @ nid %llu", vi->nid);
75 DBG_BUGON(1);
76 ret = -EFSCORRUPTED;
77 goto out_unlock;
78 }
79
80 pos = erofs_iloc(inode) + vi->inode_isize;
81 ih = erofs_read_metabuf(&buf, sb, pos, erofs_inode_in_metabox(inode));
82 if (IS_ERR(ih)) {
83 ret = PTR_ERR(ih);
84 goto out_unlock;
85 }
86 vi->xattr_name_filter = le32_to_cpu(ih->h_name_filter);
87 vi->xattr_shared_count = ih->h_shared_count;
88 if ((u32)vi->xattr_shared_count * sizeof(__le32) >
89 vi->xattr_isize - sizeof(struct erofs_xattr_ibody_header)) {
90 erofs_err(sb, "invalid h_shared_count %u @ nid %llu",
91 vi->xattr_shared_count, vi->nid);
92 ret = -EFSCORRUPTED;
93 goto out_unlock;
94 }
95 vi->xattr_shared_xattrs = kmalloc_objs(uint, vi->xattr_shared_count);
96 if (!vi->xattr_shared_xattrs) {
97 ret = -ENOMEM;
98 goto out_unlock;
99 }
100
101 /* skip the ibody header and read the shared xattr array */
102 pos += sizeof(struct erofs_xattr_ibody_header);
103 for (i = 0; i < vi->xattr_shared_count; ++i) {
104 xattr_id = erofs_bread(&buf, pos + i * sizeof(__le32), true);
105 if (IS_ERR(xattr_id)) {
106 kfree(vi->xattr_shared_xattrs);
107 vi->xattr_shared_xattrs = NULL;
108 ret = PTR_ERR(xattr_id);
109 goto out_unlock;
110 }
111 vi->xattr_shared_xattrs[i] = le32_to_cpu(*xattr_id);
112 }
113
114 /* paired with smp_mb() at the beginning of the function. */
115 smp_mb();
116 set_bit(EROFS_I_EA_INITED_BIT, &vi->flags);
117 out_unlock:
118 erofs_put_metabuf(&buf);
119 clear_and_wake_up_bit(EROFS_I_BL_XATTR_BIT, &vi->flags);
120 return ret;
121 }
122
erofs_xattr_copy_to_buffer(struct erofs_xattr_iter * it,unsigned int len)123 static int erofs_xattr_copy_to_buffer(struct erofs_xattr_iter *it,
124 unsigned int len)
125 {
126 unsigned int slice, processed;
127 struct super_block *sb = it->sb;
128
129 for (processed = 0; processed < len; processed += slice) {
130 it->kaddr = erofs_bread(&it->buf, it->pos, true);
131 if (IS_ERR(it->kaddr))
132 return PTR_ERR(it->kaddr);
133
134 slice = min_t(unsigned int, sb->s_blocksize -
135 erofs_blkoff(sb, it->pos), len - processed);
136 memcpy(it->buffer + it->buffer_ofs, it->kaddr, slice);
137 it->buffer_ofs += slice;
138 it->pos += slice;
139 }
140 return 0;
141 }
142
erofs_listxattr_foreach(struct erofs_xattr_iter * it)143 static int erofs_listxattr_foreach(struct erofs_xattr_iter *it)
144 {
145 struct erofs_xattr_entry entry;
146 unsigned int base_index, name_total, prefix_len, infix_len = 0;
147 const char *prefix, *infix = NULL;
148 int err;
149
150 /* 1. handle xattr entry */
151 entry = *(struct erofs_xattr_entry *)it->kaddr;
152 it->pos += sizeof(struct erofs_xattr_entry);
153
154 base_index = entry.e_name_index;
155 if (entry.e_name_index & EROFS_XATTR_LONG_PREFIX) {
156 struct erofs_sb_info *sbi = EROFS_SB(it->sb);
157 struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
158 (entry.e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
159
160 if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count)
161 return 0;
162 infix = pf->prefix->infix;
163 infix_len = pf->infix_len;
164 base_index = pf->prefix->base_index;
165 }
166
167 prefix = erofs_xattr_prefix(base_index, it->dentry);
168 if (!prefix)
169 return 0;
170 prefix_len = strlen(prefix);
171 name_total = prefix_len + infix_len + entry.e_name_len + 1;
172
173 if (!it->buffer) {
174 it->buffer_ofs += name_total;
175 return 0;
176 }
177
178 if (it->buffer_ofs + name_total > it->buffer_size)
179 return -ERANGE;
180
181 memcpy(it->buffer + it->buffer_ofs, prefix, prefix_len);
182 memcpy(it->buffer + it->buffer_ofs + prefix_len, infix, infix_len);
183 it->buffer_ofs += prefix_len + infix_len;
184
185 /* 2. handle xattr name */
186 err = erofs_xattr_copy_to_buffer(it, entry.e_name_len);
187 if (err)
188 return err;
189
190 it->buffer[it->buffer_ofs++] = '\0';
191 return 0;
192 }
193
erofs_getxattr_foreach(struct erofs_xattr_iter * it)194 static int erofs_getxattr_foreach(struct erofs_xattr_iter *it)
195 {
196 struct super_block *sb = it->sb;
197 struct erofs_xattr_entry entry;
198 unsigned int slice, processed, value_sz;
199
200 /* 1. handle xattr entry */
201 entry = *(struct erofs_xattr_entry *)it->kaddr;
202 it->pos += sizeof(struct erofs_xattr_entry);
203 value_sz = le16_to_cpu(entry.e_value_size);
204
205 /* should also match the infix for long name prefixes */
206 if (entry.e_name_index & EROFS_XATTR_LONG_PREFIX) {
207 struct erofs_sb_info *sbi = EROFS_SB(sb);
208 struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
209 (entry.e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
210
211 if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count)
212 return -ENODATA;
213
214 if (it->index != pf->prefix->base_index ||
215 it->name.len != entry.e_name_len + pf->infix_len)
216 return -ENODATA;
217
218 if (memcmp(it->name.name, pf->prefix->infix, pf->infix_len))
219 return -ENODATA;
220
221 it->infix_len = pf->infix_len;
222 } else {
223 if (it->index != entry.e_name_index ||
224 it->name.len != entry.e_name_len)
225 return -ENODATA;
226
227 it->infix_len = 0;
228 }
229
230 /* 2. handle xattr name */
231 for (processed = 0; processed < entry.e_name_len; processed += slice) {
232 it->kaddr = erofs_bread(&it->buf, it->pos, true);
233 if (IS_ERR(it->kaddr))
234 return PTR_ERR(it->kaddr);
235
236 slice = min_t(unsigned int,
237 sb->s_blocksize - erofs_blkoff(sb, it->pos),
238 entry.e_name_len - processed);
239 if (memcmp(it->name.name + it->infix_len + processed,
240 it->kaddr, slice))
241 return -ENODATA;
242 it->pos += slice;
243 }
244
245 /* 3. handle xattr value */
246 if (!it->buffer) {
247 it->buffer_ofs = value_sz;
248 return 0;
249 }
250
251 if (it->buffer_size < value_sz)
252 return -ERANGE;
253
254 return erofs_xattr_copy_to_buffer(it, value_sz);
255 }
256
erofs_xattr_iter_inline(struct erofs_xattr_iter * it,struct inode * inode,bool getxattr)257 static int erofs_xattr_iter_inline(struct erofs_xattr_iter *it,
258 struct inode *inode, bool getxattr)
259 {
260 struct erofs_inode *const vi = EROFS_I(inode);
261 unsigned int xattr_header_sz, remaining, entry_sz;
262 erofs_off_t next_pos;
263 int ret;
264
265 xattr_header_sz = sizeof(struct erofs_xattr_ibody_header) +
266 sizeof(u32) * vi->xattr_shared_count;
267 if (xattr_header_sz >= vi->xattr_isize) {
268 DBG_BUGON(xattr_header_sz > vi->xattr_isize);
269 return -ENODATA;
270 }
271
272 ret = erofs_init_metabuf(&it->buf, it->sb, erofs_inode_in_metabox(inode));
273 if (ret)
274 return ret;
275 remaining = vi->xattr_isize - xattr_header_sz;
276 it->pos = erofs_iloc(inode) + vi->inode_isize + xattr_header_sz;
277
278 while (remaining) {
279 it->kaddr = erofs_bread(&it->buf, it->pos, true);
280 if (IS_ERR(it->kaddr))
281 return PTR_ERR(it->kaddr);
282
283 entry_sz = erofs_xattr_entry_size(it->kaddr);
284 /* xattr on-disk corruption: xattr entry beyond xattr_isize */
285 if (remaining < entry_sz) {
286 DBG_BUGON(1);
287 return -EFSCORRUPTED;
288 }
289 remaining -= entry_sz;
290 next_pos = it->pos + entry_sz;
291
292 if (getxattr)
293 ret = erofs_getxattr_foreach(it);
294 else
295 ret = erofs_listxattr_foreach(it);
296 if ((getxattr && ret != -ENODATA) || (!getxattr && ret))
297 break;
298
299 it->pos = next_pos;
300 }
301 return ret;
302 }
303
erofs_xattr_iter_shared(struct erofs_xattr_iter * it,struct inode * inode,bool getxattr)304 static int erofs_xattr_iter_shared(struct erofs_xattr_iter *it,
305 struct inode *inode, bool getxattr)
306 {
307 struct erofs_inode *const vi = EROFS_I(inode);
308 struct super_block *const sb = it->sb;
309 struct erofs_sb_info *sbi = EROFS_SB(sb);
310 unsigned int i = 0;
311 int ret;
312
313 ret = erofs_init_metabuf(&it->buf, sb,
314 erofs_sb_has_shared_ea_in_metabox(sbi));
315 if (ret)
316 return ret;
317
318 while (i < vi->xattr_shared_count) {
319 it->pos = erofs_pos(sb, sbi->xattr_blkaddr) +
320 vi->xattr_shared_xattrs[i++] * sizeof(__le32);
321 it->kaddr = erofs_bread(&it->buf, it->pos, true);
322 if (IS_ERR(it->kaddr))
323 return PTR_ERR(it->kaddr);
324
325 if (getxattr)
326 ret = erofs_getxattr_foreach(it);
327 else
328 ret = erofs_listxattr_foreach(it);
329 if ((getxattr && ret != -ENODATA) || (!getxattr && ret))
330 break;
331 }
332 return i ? ret : -ENODATA;
333 }
334
erofs_getxattr(struct inode * inode,int index,const char * name,void * buffer,size_t buffer_size)335 static int erofs_getxattr(struct inode *inode, int index, const char *name,
336 void *buffer, size_t buffer_size)
337 {
338 int ret;
339 unsigned int hashbit;
340 struct erofs_xattr_iter it;
341 struct erofs_inode *vi = EROFS_I(inode);
342 struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
343
344 if (!name)
345 return -EINVAL;
346
347 ret = erofs_init_inode_xattrs(inode);
348 if (ret)
349 return ret;
350
351 /* reserved flag is non-zero if there's any change of on-disk format */
352 if (erofs_sb_has_xattr_filter(sbi) && !sbi->xattr_filter_reserved) {
353 hashbit = xxh32(name, strlen(name),
354 EROFS_XATTR_FILTER_SEED + index);
355 hashbit &= EROFS_XATTR_FILTER_BITS - 1;
356 if (vi->xattr_name_filter & (1U << hashbit))
357 return -ENODATA;
358 }
359
360 it.index = index;
361 it.name = QSTR(name);
362 if (it.name.len > EROFS_NAME_LEN)
363 return -ERANGE;
364
365 it.sb = inode->i_sb;
366 it.buf = __EROFS_BUF_INITIALIZER;
367 it.buffer = buffer;
368 it.buffer_size = buffer_size;
369 it.buffer_ofs = 0;
370
371 ret = erofs_xattr_iter_inline(&it, inode, true);
372 if (ret == -ENODATA)
373 ret = erofs_xattr_iter_shared(&it, inode, true);
374 erofs_put_metabuf(&it.buf);
375 return ret ? ret : it.buffer_ofs;
376 }
377
erofs_listxattr(struct dentry * dentry,char * buffer,size_t buffer_size)378 ssize_t erofs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
379 {
380 int ret;
381 struct erofs_xattr_iter it;
382 struct inode *inode = d_inode(dentry);
383
384 ret = erofs_init_inode_xattrs(inode);
385 if (ret == -ENODATA)
386 return 0;
387 if (ret)
388 return ret;
389
390 it.sb = dentry->d_sb;
391 it.buf = __EROFS_BUF_INITIALIZER;
392 it.dentry = dentry;
393 it.buffer = buffer;
394 it.buffer_size = buffer_size;
395 it.buffer_ofs = 0;
396
397 ret = erofs_xattr_iter_inline(&it, inode, false);
398 if (!ret || ret == -ENODATA)
399 ret = erofs_xattr_iter_shared(&it, inode, false);
400 if (ret == -ENODATA)
401 ret = 0;
402 erofs_put_metabuf(&it.buf);
403 return ret ? ret : it.buffer_ofs;
404 }
405
erofs_xattr_user_list(struct dentry * dentry)406 static bool erofs_xattr_user_list(struct dentry *dentry)
407 {
408 return test_opt(&EROFS_SB(dentry->d_sb)->opt, XATTR_USER);
409 }
410
erofs_xattr_trusted_list(struct dentry * dentry)411 static bool erofs_xattr_trusted_list(struct dentry *dentry)
412 {
413 return capable(CAP_SYS_ADMIN);
414 }
415
erofs_xattr_generic_get(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size)416 static int erofs_xattr_generic_get(const struct xattr_handler *handler,
417 struct dentry *unused, struct inode *inode,
418 const char *name, void *buffer, size_t size)
419 {
420 if (handler->flags == EROFS_XATTR_INDEX_USER &&
421 !test_opt(&EROFS_I_SB(inode)->opt, XATTR_USER))
422 return -EOPNOTSUPP;
423
424 return erofs_getxattr(inode, handler->flags, name, buffer, size);
425 }
426
427 static const struct xattr_handler erofs_xattr_user_handler = {
428 .prefix = XATTR_USER_PREFIX,
429 .flags = EROFS_XATTR_INDEX_USER,
430 .list = erofs_xattr_user_list,
431 .get = erofs_xattr_generic_get,
432 };
433
434 static const struct xattr_handler erofs_xattr_trusted_handler = {
435 .prefix = XATTR_TRUSTED_PREFIX,
436 .flags = EROFS_XATTR_INDEX_TRUSTED,
437 .list = erofs_xattr_trusted_list,
438 .get = erofs_xattr_generic_get,
439 };
440
441 #ifdef CONFIG_EROFS_FS_SECURITY
442 static const struct xattr_handler erofs_xattr_security_handler = {
443 .prefix = XATTR_SECURITY_PREFIX,
444 .flags = EROFS_XATTR_INDEX_SECURITY,
445 .get = erofs_xattr_generic_get,
446 };
447 #endif
448
449 const struct xattr_handler * const erofs_xattr_handlers[] = {
450 &erofs_xattr_user_handler,
451 &erofs_xattr_trusted_handler,
452 #ifdef CONFIG_EROFS_FS_SECURITY
453 &erofs_xattr_security_handler,
454 #endif
455 NULL,
456 };
457
erofs_xattr_prefix(unsigned int idx,struct dentry * dentry)458 static const char *erofs_xattr_prefix(unsigned int idx, struct dentry *dentry)
459 {
460 static const struct xattr_handler * const xattr_handler_map[] = {
461 [EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
462 #ifdef CONFIG_EROFS_FS_POSIX_ACL
463 [EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &nop_posix_acl_access,
464 [EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &nop_posix_acl_default,
465 #endif
466 [EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
467 #ifdef CONFIG_EROFS_FS_SECURITY
468 [EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
469 #endif
470 };
471 const struct xattr_handler *handler = NULL;
472
473 if (idx && idx < ARRAY_SIZE(xattr_handler_map)) {
474 handler = xattr_handler_map[idx];
475 if (xattr_handler_can_list(handler, dentry))
476 return xattr_prefix(handler);
477 }
478 return NULL;
479 }
480
erofs_xattr_prefixes_cleanup(struct super_block * sb)481 void erofs_xattr_prefixes_cleanup(struct super_block *sb)
482 {
483 struct erofs_sb_info *sbi = EROFS_SB(sb);
484 int i;
485
486 if (sbi->xattr_prefixes) {
487 for (i = 0; i < sbi->xattr_prefix_count; i++)
488 kfree(sbi->xattr_prefixes[i].prefix);
489 kfree(sbi->xattr_prefixes);
490 sbi->xattr_prefixes = NULL;
491 }
492 }
493
erofs_xattr_prefixes_init(struct super_block * sb)494 int erofs_xattr_prefixes_init(struct super_block *sb)
495 {
496 struct erofs_sb_info *sbi = EROFS_SB(sb);
497 struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
498 erofs_off_t pos = (erofs_off_t)sbi->xattr_prefix_start << 2;
499 struct erofs_xattr_prefix_item *pfs;
500 int ret = 0, i, len;
501 bool plain = erofs_sb_has_plain_xattr_pfx(sbi);
502
503 if (!sbi->xattr_prefix_count)
504 return 0;
505
506 pfs = kzalloc_objs(*pfs, sbi->xattr_prefix_count);
507 if (!pfs)
508 return -ENOMEM;
509
510 if (!plain) {
511 if (erofs_sb_has_metabox(sbi))
512 (void)erofs_init_metabuf(&buf, sb, true);
513 else if (sbi->packed_inode)
514 buf.mapping = sbi->packed_inode->i_mapping;
515 else
516 plain = true;
517 }
518 if (plain)
519 (void)erofs_init_metabuf(&buf, sb, false);
520
521 for (i = 0; i < sbi->xattr_prefix_count; i++) {
522 void *ptr = erofs_read_metadata(sb, &buf, &pos, &len);
523
524 if (IS_ERR(ptr)) {
525 ret = PTR_ERR(ptr);
526 break;
527 } else if (len < sizeof(*pfs->prefix) ||
528 len > EROFS_NAME_LEN + sizeof(*pfs->prefix)) {
529 kfree(ptr);
530 ret = -EFSCORRUPTED;
531 break;
532 }
533 pfs[i].prefix = ptr;
534 pfs[i].infix_len = len - sizeof(struct erofs_xattr_long_prefix);
535 }
536
537 erofs_put_metabuf(&buf);
538 if (!ret && erofs_sb_has_ishare_xattrs(sbi)) {
539 struct erofs_xattr_prefix_item *pf = pfs + sbi->ishare_xattr_prefix_id;
540 struct erofs_xattr_long_prefix *newpfx;
541
542 newpfx = krealloc(pf->prefix,
543 sizeof(*newpfx) + pf->infix_len + 1, GFP_KERNEL);
544 if (newpfx) {
545 newpfx->infix[pf->infix_len] = '\0';
546 pf->prefix = newpfx;
547 } else {
548 ret = -ENOMEM;
549 }
550 }
551 sbi->xattr_prefixes = pfs;
552 if (ret)
553 erofs_xattr_prefixes_cleanup(sb);
554 return ret;
555 }
556
557 #ifdef CONFIG_EROFS_FS_POSIX_ACL
erofs_get_acl(struct inode * inode,int type,bool rcu)558 struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu)
559 {
560 struct posix_acl *acl;
561 int prefix, rc;
562 char *value = NULL;
563
564 if (rcu)
565 return ERR_PTR(-ECHILD);
566
567 switch (type) {
568 case ACL_TYPE_ACCESS:
569 prefix = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS;
570 break;
571 case ACL_TYPE_DEFAULT:
572 prefix = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT;
573 break;
574 default:
575 return ERR_PTR(-EINVAL);
576 }
577
578 rc = erofs_getxattr(inode, prefix, "", NULL, 0);
579 if (rc > 0) {
580 value = kmalloc(rc, GFP_KERNEL);
581 if (!value)
582 return ERR_PTR(-ENOMEM);
583 rc = erofs_getxattr(inode, prefix, "", value, rc);
584 }
585
586 if (rc == -ENODATA)
587 acl = NULL;
588 else if (rc < 0)
589 acl = ERR_PTR(rc);
590 else
591 acl = posix_acl_from_xattr(&init_user_ns, value, rc);
592 kfree(value);
593 return acl;
594 }
595
erofs_inode_has_noacl(struct inode * inode,void * kaddr,unsigned int ofs)596 bool erofs_inode_has_noacl(struct inode *inode, void *kaddr, unsigned int ofs)
597 {
598 static const unsigned int bitmask =
599 BIT(21) | /* system.posix_acl_default */
600 BIT(30); /* system.posix_acl_access */
601 struct erofs_sb_info *sbi = EROFS_I_SB(inode);
602 const struct erofs_xattr_ibody_header *ih = kaddr + ofs;
603
604 if (EROFS_I(inode)->xattr_isize < sizeof(*ih))
605 return true;
606
607 if (erofs_sb_has_xattr_filter(sbi) && !sbi->xattr_filter_reserved &&
608 !check_add_overflow(ofs, sizeof(*ih), &ofs) &&
609 ofs <= i_blocksize(inode)) {
610 if ((le32_to_cpu(ih->h_name_filter) & bitmask) == bitmask)
611 return true;
612 }
613 return false;
614 }
615 #endif
616
617 #ifdef CONFIG_EROFS_FS_PAGE_CACHE_SHARE
erofs_xattr_fill_inode_fingerprint(struct erofs_inode_fingerprint * fp,struct inode * inode,const char * domain_id)618 int erofs_xattr_fill_inode_fingerprint(struct erofs_inode_fingerprint *fp,
619 struct inode *inode, const char *domain_id)
620 {
621 struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
622 struct erofs_xattr_prefix_item *prefix;
623 const char *infix;
624 int valuelen, base_index;
625
626 if (!test_opt(&sbi->opt, INODE_SHARE))
627 return -EOPNOTSUPP;
628 if (!sbi->xattr_prefixes)
629 return -EINVAL;
630 prefix = sbi->xattr_prefixes + sbi->ishare_xattr_prefix_id;
631 infix = prefix->prefix->infix;
632 base_index = prefix->prefix->base_index;
633 valuelen = erofs_getxattr(inode, base_index, infix, NULL, 0);
634 if (valuelen <= 0 || valuelen > (1 << sbi->blkszbits))
635 return -EFSCORRUPTED;
636 fp->size = valuelen + (domain_id ? strlen(domain_id) : 0);
637 fp->opaque = kmalloc(fp->size, GFP_KERNEL);
638 if (!fp->opaque)
639 return -ENOMEM;
640 if (valuelen != erofs_getxattr(inode, base_index, infix,
641 fp->opaque, valuelen)) {
642 kfree(fp->opaque);
643 fp->opaque = NULL;
644 return -EFSCORRUPTED;
645 }
646 memcpy(fp->opaque + valuelen, domain_id, fp->size - valuelen);
647 return 0;
648 }
649 #endif
650